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Finding the Fourth Proportional to 368.79, 553.34 and 137.85

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Solution

The fourth proportional to 368.79, 553.34 and 137.85 is: 206.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.79 : 553.34 = 137.85 : x
  2. Step 2: Convert to fraction form
    368.79/553.34 = 137.85/x
  3. Step 3: Cross multiply
    368.79x = 553.34 × 137.85
  4. Step 4: Simplify right side
    368.79x = 76,277.92
  5. Step 5: Solve for x
    x = 76,277.92/368.79
  6. Step 6: Final answer
    x = 206.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.